Add support for C++ `std::regex` to benchmarks#459

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mkrupcale wants to merge 3 commits intorust-lang:masterfrom mkrupcale:bench-stdcpp

+341-6

Commits on Mar 15, 2018

Add support for C++ std::regex to benchmarks
mkrupcale
committed

Commits on Mar 16, 2018

Add support for libc++ implementation of C++ std::regex
mkrupcale
committed

Commits on Mar 24, 2018

Add support for C++ boost::regex to benchmarks
mkrupcale
committed